Origin of the insulating and superconducting phases in molecular solid $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$
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2024
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| author | Shin, Dongbin Pavošević, Fabijan Tancogne-Dejean, Nicolas Buzzi, Michele Boström, Emil Viñas Rubio, Angel |
| author_facet | Shin, Dongbin Pavošević, Fabijan Tancogne-Dejean, Nicolas Buzzi, Michele Boström, Emil Viñas Rubio, Angel |
| contents | Recent studies of organic molecular solids are highlighted by their complex phase diagram and light-induced phenomena, such as Mott insulator, spin liquid phase, and superconductivity. However, a discrepancy between experimental observation and first-principle calculation on the $κ$-(BEDT-TTF)$_2$X family inhibits understanding their properties. Here, we revisit the electronic structure of $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ with the recently developed DFT+GOU method to correct the energy level of molecular orbital states in the molecular solid. Our work reveals that the insulating electronic structure of $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ originates from the energy gap between the highest occupied and the lowest unoccupied molecular orbital states of the BEDT-TTF dimers, that are the periodic unit of the molecular solid. We verify that our calculation result provides consistent band gap, optical conductivity, and evolution of the metal-insulator transition as a function of pressure with experimental observations. Especially, the superconducting dome of $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$, which originates from the flat band state at the Fermi level, is reproduced. Additionally, we constructed a new low-energy lattice model based on the ability of electronic structure data that can be used to address many-body physics, such as quantum spin liquid and double-holon dynamics. Our provides a deeper understanding of the complex phase diagram and various light-induced phenomena in the $κ$-(BEDT-TTF)$_2$X family and the other complex organic molecular solids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_18088 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of the insulating and superconducting phases in molecular solid $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ Shin, Dongbin Pavošević, Fabijan Tancogne-Dejean, Nicolas Buzzi, Michele Boström, Emil Viñas Rubio, Angel Strongly Correlated Electrons Materials Science Recent studies of organic molecular solids are highlighted by their complex phase diagram and light-induced phenomena, such as Mott insulator, spin liquid phase, and superconductivity. However, a discrepancy between experimental observation and first-principle calculation on the $κ$-(BEDT-TTF)$_2$X family inhibits understanding their properties. Here, we revisit the electronic structure of $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ with the recently developed DFT+GOU method to correct the energy level of molecular orbital states in the molecular solid. Our work reveals that the insulating electronic structure of $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ originates from the energy gap between the highest occupied and the lowest unoccupied molecular orbital states of the BEDT-TTF dimers, that are the periodic unit of the molecular solid. We verify that our calculation result provides consistent band gap, optical conductivity, and evolution of the metal-insulator transition as a function of pressure with experimental observations. Especially, the superconducting dome of $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$, which originates from the flat band state at the Fermi level, is reproduced. Additionally, we constructed a new low-energy lattice model based on the ability of electronic structure data that can be used to address many-body physics, such as quantum spin liquid and double-holon dynamics. Our provides a deeper understanding of the complex phase diagram and various light-induced phenomena in the $κ$-(BEDT-TTF)$_2$X family and the other complex organic molecular solids. |
| title | Origin of the insulating and superconducting phases in molecular solid $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2412.18088 |